[PATCH 3.13.y-ckt 73/80] ASoC: sgtl5000: add delay before first I2C access
From: Kamal Mostafa
Date: Thu Mar 19 2015 - 18:40:57 EST
3.13.11-ckt17 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Nelson <eric.nelson@xxxxxxxxxxxxxxxxxxx>
commit 58cc9c9a175885bbf6bae3acf18233d0a8229a84 upstream.
To quote from section 1.3.1 of the data sheet:
The SGTL5000 has an internal reset that is deasserted
8 SYS_MCLK cycles after all power rails have been brought
up. After this time, communication can start
...
1.0us represents 8 SYS_MCLK cycles at the minimum 8.0 MHz SYS_MCLK.
Signed-off-by: Eric Nelson <eric.nelson@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
sound/soc/codecs/sgtl5000.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index b76c6b6..ba73f83 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1550,6 +1550,9 @@ static int sgtl5000_i2c_probe(struct i2c_client *client,
if (ret)
return ret;
+ /* Need 8 clocks before I2C accesses */
+ udelay(1);
+
/* read chip information */
ret = regmap_read(sgtl5000->regmap, SGTL5000_CHIP_ID, ®);
if (ret)
--
1.9.1
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